Hadoop group customization does not take affect

To customize the hadoop group, when it was changed from "hadoop" to "hadoopgroup", it didn't look like it worked.
root@ip-10-85-135-237 hdfsuser# id hdfs
uid=495(hdfs) gid=494(hdfs) groups=494(hdfs),495(hadoop)
And looking at the /etc/group file
puppet:x:497:
hadoopgroup:x:500:
rrdcached:x:496:
apache:x:48:
hadoop:x:495:mapred,hdfs